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通过控制生育期水分条件形成不同程度的干旱胁迫,对冬小麦生长、产量及生理指标和冠层高光谱反射率对干旱胁迫的反应进行监测,建立冬小麦减产率与生长、生理及冠层光谱反射率的相关模型。研究结果表明:不同生育期冬小麦干物质积累速度随水分胁迫程度的增大而减小;叶绿素含量与水分条件的关系不同于其他参数,表现为中等水分条件下叶绿素含量最大,严重水分胁迫下叶绿素含量最低;不同水分条件下光合速率呈两种不同日变化特征,且正常供水处理的光合速率明显高于严重干旱处理。光合速率和增强植被指数(EVI)同冬小麦减产率相关性较强,能够建立较好的关系模型用于小麦产量预测。
By controlling the water stress during the growth period to form different degrees of drought stress, the responses of winter wheat growth, yield and physiological indices and canopy hyperspectral reflectance to drought stress were monitored, and the yield reduction, growth, physiology and canopy spectral reflectance Related models. The results showed that: the dry matter accumulation rate of winter wheat at different growth stages decreased with the increase of water stress; the relationship between chlorophyll content and water content was different from other parameters, which showed that the chlorophyll content was the highest under moderate water stress; under the severe water stress, The content of photosynthetic rate under different water conditions showed two different diurnal variation characteristics, and the photosynthetic rate of normal water supply treatment was significantly higher than the severe drought treatment. The correlation between photosynthetic rate and enhanced vegetation index (EVI) and winter wheat yield was strong, and a good relationship model could be established for wheat yield prediction.